You can still buy the thin RF speakers for the inner fairing. I had a set of Polk MM651's when I had the RF 300x4, they worked great. The Polks are 2.7 ohms, not 4 but didn't seem to cause too much harm to the amp, (I don't think I would try it at full volume for a long time). You would hook the RF amp to the speaker output of the HK radio on the high level input. No converter or preamp needed, just adjust the input. Also you would need to run a power and gnd to the amp, not a big deal.There are several reasonanbly priced 4ohm 6.5" speakers that will fit in the fairing with adaptors. Keep checking Hawgwired, if you can get a set of there 4 ohm speakers that would be nice, every now and then they have an open box special.
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......
Last edited by dbell66253; 02-06-2013 at 09:42 AM.